I don't think it's all that radical.
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@Gus L, by any chance do you remember any particularly prominent discussions of 1:1 timekeeping from back in the OSR (I know we've been in the Post-OSR era for around 5 years by your reckoning)? I could swear that got plenty of airtime in the movement long before Jeffro showed up.
I don't remember a specific post or discussion, though I do remember talking about 1:1 time, likely based on the AD&D DMG advice on it, when Necropraxis was running his Pahvelorn campaign - we used basically 1:1 in that (by which I mean days between sessions counted as days in the game world), but dropped it pretty quickly really because it's not really meaningful except as a general sense of like "a weekish passes between expeditions - you can't camp in the dungeon and reroll your HP each session" except under really distinct circumstances.
I think 1:1 time only really matters if you're running a public open table campaign, maybe multiple referees or maybe a depressed recently fired insurance auditor who is running games 30 hours a week for multiple groups in the same world when he's not making shoes on the side... point being, to me it's an amusing idea, but not usable. I think there's a lot of that in the "BrOSR" and similar reactionary Post-OSR scenes. A few contortions and obsessions presented as the truth of how the game was played in the good old days ... but in reality it's all nostalgic projection. Nostalgia of course is fine until you use it to build a cult of personality or as the basis of a movement - and then it needs someone to blame for ruining the made up past your rworship.
Which I think sums up the BrOSR, and to a far lesser degree the OSR project. The OSR started as a backlash to 90's high trad style games - and to 3.5E, but it grew inconsistently. I think to the degree OSR (or POSR stuff) claims primacy because it replicates some aspect of an old game is the point where it goes to far. The OSR was always a novel twist on old rulesets viewed with new goals. I don't mean it's stated intent, but the reality of it, there's no consistent early play style and the closest one gets is Gygax TST "classic" or "tournament" style - which has never appealed to me because it's too much about rules lawyering and getting three points for casting invisibility on the halfling (to quote Slavelords scoring system). It's meta gaming mostly. Of course it postdates all the weird evolutions of the late 1970's and like AD&D represents Gygax's heel-turn.
I much prefer the Gygax of Blackmoor's introduction where he presents the possibility of everyone having their personal D&D and trading them around. D&D rules as a toolkit, not dogma.